<!DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="utf-8">
		<link rel="stylesheet" href="style.css">
		<title>30 文字上下滑动按钮</title>
	</head>
	<body>
		<div class="app">
			<div class="btn30">
				<span class="btn-text30">探</span>
				<span class="btn-text30">索</span>
				<span class="btn-text30">未</span>
				<span class="btn-text30">知</span>
			</div>
		</div>
	</body>
</html>